[NEED URGENT HELP] All controllers showing 404 except default controller

Just blind guess - Try to add "RewriteBase /" to your .htaccess file:

Code:

RewriteEngine On
RewriteBase /
...

Or try any of these:
.htaccess for CodeIgniter

Nothing

Code:

RewriteEngine On

RewriteBase /
RewriteCond %{REQUEST_URI} ^system.*
RewriteCond $1 !^(index\.php|images|js|uploads|css|robots\.txt)
RewriteRule ^(.*)$ /index.php/$1 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php/$1 [L]

"Who thinks in code"
Perfectly describes who I am
mbparvez.me